[sdiy] 910 pF caps (Buchla 292C/266-3)

[jhaible]

I'd use 820pF and 100pF in parallel,
or re-calculate the resistors ( x 0.91)
and use 1nF.

JH.


-----Ursprüngliche Nachricht-----
Von: Fahl, Romeo <RFahl at extensis.com>
An: <synth-diy at dropmix.xs4all.nl>
Gesendet: Montag, 30. September 2002 19:39
Betreff: [sdiy] 910 pF caps (Buchla 292C/266-3)


> Hello,
>
> I'm having hard time finding 910 pF caps from the usual vendors that I go
> through.  Mouser is out of stock on the one part that they have, Allied
has
> none, nor does Digikey.
>
> What I'm wondering is, if I could substitute the 910 pF caps with 1000 pF
in
> any of the projects I'm working on.
>
> The first one is Bucha's Source of Uncertainty, in the Fluctuating Random
> Voltages module:
>
> http://www.musicsynthesizer.com/Buchla/266-3.jpg
>
> I'm not quite sure what C11A and 12A are doing (around IC 3 near module
> inputs).  The second couples IC 5 to 6 (C17A and 18A).  Seems like that
one
> is less critical.
>
> The other project is an updated version of Buchla's LoPass Gate (292).
>
> http://www.simple-answer.com/lopass-gate.jpg
>
> C5 Appears to be doing some audio filtering, so my guess is that it's more
> critical  to have an accurate value there.  I suspect that if I change the
> 4.7Meg resistor, I can compensate for a different value.
>
> So, can anyone tell me if 1000pF caps are acceptable for any of the above
> circuits?
>
> Romeo
>